use Modern::Perl;

my ( @table, $id1, $id2, $i );

push @table, [ (split) ] while <DATA>;

do { $id1 .= $_->[2]; $id2 .= $_->[3] } for @table;
$id1 =~ s/(?<=(.))(0+)(?=(.))/$1==$3?$1 x length $2:$2/eg;
$id2 =~ s/(?<=(.))(0+)(?=(.))/$1==$3?$1 x length $2:$2/eg;

$i = 0;
say "$_->[0]\t$_->[1]\t"
  . substr( $id1, $i,   1 ) . "\t"
  . substr( $id2, $i++, 1 )
  for @table;

__DATA__
1	100	1	2
101	200	1	2
201	300	1	0
301	400	1	0
401	500	0	2
501	600	0	2
601	700	0	0
701	800	1	1
801	900	1	2